Feature #2429 MvMODE multivar intensity

replace multivar_intensity_flag with multivar_intensity_compare_fcst and multivar_intensity_compare_obs for multi-variate MODE

Pull Request Testing

Added unit tests, updated existing use cases to use new variables

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[X] Do these changes include sufficient documentation updates, ensuring that no errors or warnings exist in the build of the documentation? [Yes]
[X] Do these changes include sufficient testing updates? [Yes]
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[X] Do these changes introduce new SonarQube findings? [No]
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[X] Please complete this pull request review by 4/28/2024.

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